Today, Baltimore and Washington are really two different metropolitan areas, and so I'm not really happy about grouping them together in one section of this website. But there was a time when the two cities were within local calling distance of each other, and so there were constraints on exchange names that require treating the entire Baltimore-Washington region as a unit.
The site will treat the region as a combination of the following areas:
Since both the Baltimore and washington suburbs (as well as the city of Baltimore) were in the same 301 area code (Note that this has changed, but the new 410 area code for Baltimore and eastern Maryland was many years in the future in the period dealt with on this site) all three had to have distinct exchanges even after the end of local dialing between the Baltimore and Washington areas, so that callers outside the 301 area could dial 301 and the appropriate number to be connected with their intended person. But since (until the 1990s) subscribers in Washington, D. C. and its suburban areas could dial to points in the entire area consisting of the District of Columbia and its Maryland and Virginia suburbs without needing to dial an area code, all three of these portions of the region also had to have distinct exchanges.
While it would be possible to consider Baltimore and its suburbs as a single area for the purposes of this site, I do not think it desirable. For me anyway, it is better to separate city and suburban exchanges into different tables, so I will do so. But even so, there were the following constraints:
Separate sets of tables have been prepared for each area. Clicking the name of the
area in the listing of the five areas above will get you to the appropriate set of
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Last modified February 6, 2009.